M&J Valve Gate Valve RQ-8

Pre-maintenance Safety and Preparation

Ensure no stem maintenance on valves with cupola while exposed to line pressure.

Is a replacement stem available prior to disassembling the valve?

Include valve serial number in correspondence with M&J Valve.

Isolate pressure source from pipeline and valve.

Cycle the valve to the mid-travel position.

Open the valve body pressure relief valve to vent trapped body/line pressure.

Cycle valve to the full open position after venting is complete.

Valve Inspection and Maintenance

Inspect, clean, and lubricate the valve components

Run the valve through a full cycle if field conditions allow

Ensure replacement stem is available

Ensure stem packing and O-rings are available for replacement

Include serial number in correspondence with M&J Valve

Isolate pressure source from the pipeline and valve

Cycle the valve to the mid travel position

Open body pressure relief valve to vent trapped body/line pressure

Cycle the valve to the full open position after venting is complete

Cycle the gate to the full open position.

Remove the stem protector, including cap and sealing device.

If there is a downstop bolt on top of the valve stem, remove the indicator rod and downstop bolt.

Inspect valve stem threads for damage and lubrication.

Apply a coat of light oil or a lubricant such as WD-40 to the stem threads and top of operator drive nut.

Inspect the manifold valves for any visible damage or wear

Clean the manifold valves thoroughly

Lubricate the manifold valves, including operator bearings and stem threads

Partially test cycle the manifold valves

Run the manifold valves through a full cycle if field conditions allow